AT&T is currently the only carrier to offer 4G LTE roaming in other countries, a change it rolled out back in December. At the time, only Canada was supported, followed by the UK. Now the carrier is rolling out the service in around a dozen additional countries. These range from locales as small as Hong Kong and Singapore to places as expansive as Australia and Russia.

AT&T now also supports 4G LTE roaming in:

Antigua & Barbuda

Australia

France

Guam

Hong Kong

Japan

Malaysia

Singapore

South Korea

Spain

Switzerland

Russia

Since carriers in different countries use various wireless frequencies, a device that works in one country may not work in another. To make matters worse, AT&T didn't pair its announcement with a price cut. So while you can technically roam at LTE speeds, that doesn't mean you can afford to do so. One wrong link could leave you wishing you stuck with 3G... or just stayed home.